thereisnodoubtthatwhatacleanerdoesismuchhardercomparedwithanyjops.我不明白that后面的怎么能成句.

Question

there is no doubt that what a cleaner does is much harder compared with any jops.我不明白that后面的怎么能成句.

Answer 1

that what a cleaner does is much harder compared with any jobs
整个这是doubt 的同位语从句,陈述其内容
从句分析：
what a cleaner does （主语从句）is（系动词） much harder（表语） compared with any jobs(分词短语作条件状语）